[ plan-i-tair-ee-uhm ]
/ 藢pl忙n 瑟藞t蓻蓹r i 蓹m /
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noun, plural plan路e路tar路i路ums, plan路e路tar路i路a [plan-i-tair-ee-uh]. /藢pl忙n 瑟藞t蓻蓹r i 蓹/.
an apparatus or model representing the planetary system.
a device that produces a representation of the heavens by the use of a number of moving projectors.
the building or room in which such a device is housed.
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Origin of planetarium

1765鈥75; <New Latin, noun use of neuter of Latin plan膿t膩riusplanetary; cf. -arium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, 漏 Random House, Inc. 2022

How to use planetarium in a sentence

British Dictionary definitions for planetarium

/ (藢pl忙n瑟藞t蓻蓹r瑟蓹m) /

noun plural -iums or -ia (-瑟蓹)
an instrument for simulating the apparent motions of the sun, moon, and planets against a background of stars by projecting images of these bodies onto the inside of a domed ceiling
a building in which such an instrument is housed
a model of the solar system, sometimes mechanized to show the relative motions of the planets
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition 漏 William Collins Sons & Co. Ltd. 1979, 1986 漏 HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012